condition mean min max ZT0-3 30.161331 30.161331 30.161331 ZT4-7 65.3814015 65.3814015 65.3814015 ZT8-11 74.938842 74.938842 74.938842 ZT12-15 59.20577 59.20577 59.20577 ZT16-19 54.909985500000005 54.909985500000005 54.909985500000005 ZT20-23 53.0856855 53.0856855 53.0856855